JP2019045834A - Pattern phase difference film, display image shielding laminate, and partition member - Google Patents

Abstract

To provide a display image shielding laminate that can prevent an image displayed on a display surface of a display from being easily visually recognized, while ensuring translucency, a pattern phase difference film that constitutes the display image shielding laminate, and a partition member that uses the display image shielding laminate.SOLUTION: A pattern phase difference film 30 is laminated with a polarizing plate 25 to constitute a display image shielding laminate 20 together with the polarizing plate. The pattern phase difference film has a plurality of types of modulation regions 35 different from each other in the direction of a slow axis SA. The display image shielding laminate 20 and a partition member 10 include the pattern phase difference film 30.SELECTED DRAWING: Figure 4

Description

  The present disclosure relates to a patterned retardation film, a display image shield laminate, and a partition member.

  As represented by a wall of a meeting room or a work room, a translucent member having visible light transparency may be used as a partitioning member for partitioning a space (for example, Patent Document 1). By imparting translucency to the partitioning member, the size, transparency, and soundness can be produced in the space partitioned by the partitioning member, and furthermore, the presence or absence of people in the space and the usage state of the space can be grasped. it can.

Unexamined-Japanese-Patent No. 2017-15892

  An apparatus having a display device such as a personal computer, a tablet, a mobile phone or the like may be brought in and used in a space partitioned by such partitioning members. And, on the display device of such a device, secret information such as personal information and trade secret may be displayed. That is, it is also assumed that the condition in which the information displayed on the display screen of the display device is viewed from outside the space through the translucent member is not preferable.

  The present disclosure has been made in consideration of the above points, and provides a display image shielding laminate capable of making it difficult to visually recognize an image displayed on a display surface of a display device while securing light transmission. With the goal. Moreover, this indication aims at provision of the pattern phase difference film which comprises a display image shielding laminated body, and provision of the division member using a display image shielding laminated body.

The patterned retardation film according to the present disclosure is
A patterned retardation film which is laminated with a polarizing plate to constitute a display image shielding laminate together with the polarizing plate,
A plurality of modulation regions different in the direction of the slow axis are provided.

  In the patterned retardation film according to the present disclosure, each modulation region may function as a λ / 2 retardation film.

  In the patterned retardation film according to the present disclosure, each modulation region may function as a λ / 4 retardation film.

  The patterned retardation film according to the present disclosure may include three or more types of modulation regions in which the directions of the slow axes are different from each other.

  The patterned retardation film according to the present disclosure may be provided with two types of modulation regions different in the direction of the slow axis by 45 °.

  The patterned retardation film according to the present disclosure may be provided with three or more modulation regions in which the direction of the slow axis changes gradually.

  In the patterned retardation film according to the present disclosure, the direction of the slow axis of the modulation area may gradually change, and the width along the arrangement direction of the modulation area may be less than 9 mm until a change of 45 °.

  In the patterned retardation film according to the present disclosure, a plurality of modulation regions of each type may be provided.

  In the patterned retardation film according to the present disclosure, the plurality of types of modulation regions may be randomly arranged.

The first display image shielding laminate according to the present disclosure is
Any of the pattern retardation films according to the present disclosure described above,
A display image shielding laminate, comprising: a polarizing plate laminated on the patterned retardation film.

The second display image shielding laminate according to the present disclosure is
A patterned retardation film according to the present disclosure as described above, wherein each modulation region functions as a λ / 4 retardation film;
A λ / 4 retardation film laminated on the patterned retardation film;
And a polarizing plate laminated on the patterned retardation film.

The partition member according to the present disclosure is
A translucent member that divides a space;
And any of the display image shielding laminates according to the present disclosure described above.

  According to the present disclosure, it is possible to make it difficult to selectively visually recognize the image displayed on the display surface of the display device while sufficiently securing the visibility through the display image shielding laminate.

FIG. 1 is a view for explaining an embodiment of the present disclosure, and is a perspective view showing a chamber partitioned by a partition member. FIG. 2 is a longitudinal sectional view showing the dividing member. FIG. 3: is a top view for demonstrating an example of the pattern retardation film contained in the display image shielding laminated body of a division member. FIG. 4 is a figure for demonstrating the effect | action of a display image shielding laminated body. FIG. 5 is a view showing a display surface of a display device on which an image is displayed. FIG. 6 is a view for explaining an image visually recognized when the display surface of FIG. 5 is observed through the display image shielding laminate. FIG. 7 is a view corresponding to FIG. 3 and is a plan view for explaining another example of the patterned retardation film. FIG. 8 is a view corresponding to FIG. 6 and for explaining an image visually recognized when the display surface of FIG. 5 is observed through the display image shielding laminate including the pattern retardation film of FIG. FIG. FIG. 9 is a view corresponding to FIG. 3 and is a plan view for explaining still another example of the patterned retardation film. FIG. 10 is a view corresponding to FIG. 6, for explaining an image visually recognized when the display surface of FIG. 5 is observed through the display image shielding laminate including the pattern retardation film of FIG. FIG. FIG. 11 is a view corresponding to FIG. 3 and is a plan view for explaining still another example of the patterned retardation film. 12 is a view corresponding to FIG. 6, for explaining an image visually recognized when the display surface of FIG. 5 is observed through the display image shielding laminate including the pattern retardation film of FIG. FIG. FIG. 13 is a diagram corresponding to FIG. 3 and is a plan view illustrating still another example of the patterned retardation film. FIG. 14 is a photograph showing a state in which the display surface of the liquid crystal display device is observed through a display image shielding laminate including a pattern retardation film of a two-gradation stripe arrangement. FIG. 15: is a photograph which shows the state which observed the display surface of the liquid crystal display device through the display image shielding laminated body containing the pattern retardation film of multi-gradation stripe arrangement | sequence. FIG. 16 is a photograph showing a state in which the display surface of the liquid crystal display device is observed through a display image shielding laminate including a pattern retardation film having a two-gradation staggered arrangement. FIG. 17 is a diagram corresponding to FIG. 4 and is a diagram for explaining a modification of the display image shielding laminate. FIG. 18 is a diagram corresponding to FIG. 2 and is a diagram for describing a modified example of the layer configuration of the display image shielding laminate. FIG. 19 is a diagram corresponding to FIG. 1 and is a diagram for describing a modified example of the partitioning member. FIG. 20 is a view for explaining another application example of the display image shielding laminate. FIG. 21 is a diagram showing the positions of the display device 50, the partitioning member 10, and the observer E at the time of visual evaluation.

  Hereinafter, an embodiment of the present disclosure will be described with reference to the drawings. In the drawings attached to the present specification, for the sake of easy illustration and understanding, the scale, the dimensional ratio in the vertical and horizontal directions, etc. are appropriately changed from those of the actual one and exaggerated.

  1 to 21 are diagrams for describing an embodiment of the present disclosure and a modification thereof. Among these, FIG. 1 shows the dividing member 10 including the display image shielding laminate 20. The dividing member 10 is a member that divides a space, in other words, a member that divides a space. In the example shown in FIG. 1, the partition member 10 is used as a part of the building material 5 which comprises a building. The building material 5 constitutes a wall W which divides the room R. In the building material 5, an opening 5a is formed. A door D that can be opened and closed is installed in one opening 5a. It is possible to enter and leave the room R through the door D. And the division member 10 is installed in the other opening 5a. The partitioning member 10 is used as a window member 11 for closing the opening 5a.

  The partition member 10 functioning as the window member 11 has visible light transparency. The room R partitioned by using the partitioning member 10 is used as, for example, a conference room, a work room, or a sick room. Since the partitioning member 10 has a light transmitting property, the inside of the room R can be grasped from the outside of the room R. For example, it can be confirmed from the outside of the room R that the desk d, the chair c, and the display device 50 disposed on the desk d are provided in the room R. By providing visible light transmission to the partitioning member 10 that partitions the chamber R, the size, transparency, and soundness can be produced in the space partitioned by the partitioning member 10. Moreover, in recent years, application to the room R of the partition member 10 which had translucency attracts attention also from the reason that work efficiency can be improved.

  On the other hand, in the space partitioned by the partitioning member 10, in many cases, a display device 50 such as a monitor or a television receiver is installed. Furthermore, in recent years, a device having a display device 50 such as a personal computer, a tablet, a smartphone, a mobile phone, etc. is brought into the room R by a user of the room R. Such display devices 50 often display confidential information such as personal information and trade secrets. When the partitioning member 10 has visible light transmission, the information displayed on the display surface 51 of the display device 50 is viewed through the partitioning member 10 from another space partitioned by the partitioning member 10. It will be done. That is, in the case where the partitioning member 10 has visible light transmission, it is possible to assume the disadvantage that the image 52 displayed on the display surface 51 of the display device 50 can be viewed through the partitioning member 10 while enjoying the advantages described above. Be done.

  In order to cope with such a disadvantage, the partitioning member 10 and the display image shielding laminate 20 according to the present embodiment provide the display device 50 while securing the transparency between the two spaces partitioned by the partitioning member 10. A device for selectively reducing the visibility of the image 52 displayed on the display surface 51 of the present invention is made. More specifically, the partition member 10 and the display image shield laminate 20 make it possible to selectively shield the image light IL using polarization of the image light IL that forms the image 52. Hereinafter, the configuration of the dividing member 10 and the operation thereof will be described.

  As shown in FIG. 2, the dividing member 10 includes a light transmitting member 15 which divides a space, and a display image shielding laminate 20 stacked on the light transmitting member 15. In the illustrated example, the dividing member 10 further includes a bonding layer 17 located between the light transmitting member 15 and the display image shielding laminate 20. The bonding layer 17 is a layer of an adhesive or an adhesive. The bonding layer 17 bonds the display image shielding laminate 20 to the light transmitting member 15.

  The translucent member 15 is a transparent member and is a member having visible light transparency. The translucent member 15 is formed as a plate-like member. The light transmittance of the light-transmissive member 15 in the visible light region is preferably 80% or more, and more preferably 90% or more. The transmittance of the light-transmissive member 15 can be measured in accordance with JIS K7361-1 (Plastic-Test Method of Total Light Transmittance of Transparent Material). In addition, although the member of high haze values, such as ground glass and a template glass, may be used as the translucent member 15, even in such a case, the one where the transmittance | permeability is high is preferable.

  The translucent member 15 also functions as a layer for supporting the display image shielding laminate 20. The translucent member 15 has a thickness sufficient as a support layer, for example, 1 mm or more and 15 mm or less.

  The material constituting the light transmitting member 15 includes acetyl cellulose resins such as triacetyl cellulose, polyester resins such as polyethylene terephthalate and polyethylene naphthalate, olefin resins such as polyethylene and polymethylpentene, acrylic resins, polyurethane Resins, such as system resin, polyether sulfone, a polycarbonate, a polysulfone, polyether, a polyether ketone, (meth) acrylonitrile, a cycloolefin polymer, a cycloolefin copolymer, are mentioned. Among them, acetyl cellulose resins, resins such as cycloolefin polymers and cycloolefin copolymers, and acrylic resins are preferable because the in-plane retardation of the transparent film base material tends to be close to zero. On the other hand, the translucent member 15 may include a glass plate. In this example, it is preferable that the display image shielding laminate 20 laminated with the light transmitting member 15 including a glass plate includes a resinous film layer. The resinous film layer may be, for example, a base material 33 of a patterned retardation film 30 described later. In this case, the resinous film layer can function as a scattering prevention layer when the glass is scattered.

  Next, the display image shielding laminate 20 will be described.

  As shown in FIG. 2, the display image shielding laminate 20 includes a surface layer 21, a patterned retardation film 30 and a polarizing plate 25 in this order. The surface layer 21 is a layer exposed to the space where the display device 50 is installed. Conversely, in the display image shielding laminate 20, the polarizing plate 25 is most distant from the space in which the display device 50 is installed. The display image shielding laminate 20 may be formed outside the room R.

  The surface layer 21 protects the polarizing plate 25 and the patterned retardation film 30. In addition, the surface layer 21 may be provided with an appropriate function as a layer forming a surface. For example, the surface layer 21 includes a hard coat layer having a hard coat function, an antireflection layer having an antireflection function, a diffusion layer having a diffusing function, an antistatic layer provided with an antistatic function, and an antifouling function. You may function as an antifouling layer etc. which it had.

  Next, the polarizing plate 25 will be described.

  The polarizing plate 25 is a member that selectively transmits light of a specific polarization state. In other words, the polarizing plate 25 is a member that transmits light of a certain polarization state at a higher transmittance than light of other polarization states.

  In the illustrated example, the polarizing plate 25 separates the incident light into one linearly polarized component oscillating in one direction and the other linearly polarized component oscillating in the other direction orthogonal to one direction. The polarizing plate 25 transmits the light of one linearly polarized component and absorbs the light of the other linearly polarized component. Such a polarizing plate 25 can typically be a member including a polarizer in which a complex of polyvinyl alcohol and iodine is formed. A polarizer can be produced by impregnating a film made of polyvinyl alcohol with iodine and then uniaxially stretching it. The polarizing plate 25 may further include a protective film laminated to the polarizer, in addition to the polarizer. As a protective film, typically, a cellulose derivative, triacetyl cellulose (TAC) can be used.

  The polarizing plate 25 may transmit light of one linearly polarized component and reflect light of the other polarized component. The polarizing plate 25 may be a member that selectively transmits one of right circularly polarized light and left circularly polarized light, and selectively absorbs or reflects the other.

  Next, the pattern retardation film 30 will be described.

  The patterned retardation film 30 is a member that causes phase modulation to transmitted light. The retardation of the patterned retardation film 30, that is, the amount of phase modulation that can be given by the patterned retardation film 30, is not particularly limited. The patterned retardation film 30 is, for example, a layer giving an n-th natural number and a retardation of n times λ / 4 (n × λ / 4), preferably a retardation of λ / 2 or λ / 4 to transmitted light can do.

  In addition, let the phase difference here be a value [nm] on the basis of the light of one of the wavelengths contained in the incident light to the display image shielding laminated body 20. FIG. For example, when visible light in a wide band enters the display image shielding laminate 20, the retardation of the patterned retardation film 30 expected as a λ / 2 retardation film is, for example, 440 nm or more, which is the central wavelength band of visible light. The wavelength can be set to 220 nm or more and 330 nm or less with reference to any wavelength [nm] included in 660 nm or less, or can be 275 nm with reference to a wavelength of 550 nm.

  As shown in FIG. 3, the patterned retardation film 30 includes a plurality of types of modulation regions 35. The direction of the slow axis SA is different among the plurality of types of modulation regions 35. Conversely, in the same type of modulation area 35, the direction of the slow axis SA is constant. Light of a certain polarization state may be transmitted through different modulation regions 35 to cause different phase modulation. As a result, light of a certain polarization state may become polarization states different from each other after passing through different modulation regions 35. The number of types of modulation regions 35 is not particularly limited as long as it is plural.

  In one specific example shown in FIG. 3, the pattern retardation film 30 has a first modulation area 35 a and a second modulation area 35 b as a plurality of types of modulation areas 35. That is, the pattern retardation film 30 shown in FIG. 3 can cause two types of phase modulation with respect to transmission light of a constant polarization state as a two-gradation pattern retardation film. In the example shown in FIG. 3, the slow axis SA of the first modulation area 35a extends in parallel with the reference direction sd orthogonal to the horizontal direction. The slow axis SA of the second modulation area 35 b extends in a direction inclined 45 ° with respect to the reference direction sd. The patterned retardation film 30 shown in FIG. 3 functions as a λ / 2 retardation film.

  In addition, in the sheet of FIG. 3, and FIGS. 4, 7, 9, 11, 13, and 17 described later, a thick arrow with an outer contour indicated by a solid line indicates the direction of the slow axis SA. . Further, the reference direction sd is along the film surface of the patterned retardation film 30. Then, in the illustrated example, the display surface 51 of the display device 50 and the dividing member 10 are held along the vertical direction. Then, in the illustrated example, the reference direction sd is parallel to the vertical direction. Further, in FIG. 4 and FIG. 17, thick black arrows indicate the polarization state of light.

  In addition, a plurality of modulation regions 35 of each type may be provided in the pattern retardation film 30. In the example shown in FIG. 3, a plurality of first modulation regions 35 a and a plurality of second modulation regions 35 b are provided. The plurality of types of modulation regions 35 are alternately arranged in one direction, and each modulation region 35 extends in a direction non-parallel to one direction. More specifically, the plurality of first modulation regions 35a are arranged in the horizontal direction, and each first modulation region 35a linearly extends in the vertical direction. That is, the plurality of first modulation regions 35a are arranged in a stripe arrangement. Similarly, the second modulation regions 35b are arranged in the horizontal direction, and the second modulation regions 35b are arranged in the horizontal direction and extend linearly in the vertical direction. That is, the plurality of second modulation regions 35b are arranged in a stripe arrangement.

  The patterned retardation film 30 may have the liquid crystal layer 31, the alignment layer 32, and the base material 33 in this order as a specific configuration.

  The liquid crystal layer 31 is a layer containing a liquid crystal material. The liquid crystalline material is preferably a rod-like compound having refractive index anisotropy. Examples of the liquid crystalline material include materials exhibiting a liquid crystal phase such as a nematic phase and a smectic phase, and among them, a liquid crystalline material exhibiting a nematic phase is preferably used. This is because a liquid crystalline material exhibiting a nematic phase can be easily aligned regularly as compared to liquid crystalline materials exhibiting another liquid crystal phase.

  As a liquid crystalline material exhibiting a nematic phase, a material having spacers at both ends of mesogen is preferable. This is because a liquid crystalline material having spacers at both ends of the mesogen is excellent in flexibility and has high transparency.

  The rod-like compound preferably has a polymerizable functional group in the molecule, and more preferably a polymerizable functional group capable of three-dimensionally crosslinking. When the rod-like compound has a polymerizable functional group, the rod-like compound is polymerized and fixed, so that the orientation stability is excellent, and the temporal change of retardation does not easily occur. The above "three-dimensional crosslinking" means that liquid crystal molecules are polymerized in three dimensions to form a network (network) structure.

  Examples of the polymerizable functional group include a polymerizable functional group that is polymerized by irradiation of ionizing radiation such as ultraviolet light and electron beam, or heating. A radically polymerizable functional group, a cationically polymerizable functional group, etc. are mentioned.

  As a liquid crystalline material which shows the wavelength-dispersion characteristic in which a phase difference increases with the wavelength increase in visible light area | region, the material described in Japanese Patent Application Publication No. 2010-522892 is mentioned, for example. The thickness of the liquid crystal layer can be appropriately set according to the type of liquid crystal material, the aspect of the modulation region 35, and the like.

  The alignment layer 32 has a function of aligning the rod-like compound contained in the liquid crystal layer 31. The alignment layer has an alignment region divided into regions corresponding to the modulation regions 35.

  The material of the alignment layer 32 is not particularly limited as long as the alignment region can be formed into a desired shape and a desired pattern. As such a constituent material, for example, a cured resin cured by irradiation of heat or ionizing radiation such as ultraviolet light or electron beam may be mentioned. Examples of the curing resin include ultraviolet curing resins, thermosetting resins, electron beam curing resins, etc., among which ultraviolet curing resins are preferable.

  Specific examples of the UV curable resin before curing of the UV curable resin include, for example, polymerizable oligomers or monomers having an acryloyl group such as urethane acrylate, epoxy acrylate, polyester acrylate, polyether acrylate, melamine acrylate, acrylic acid, The thing etc. which added the photoinitiator and the arbitrary additives to single substance or compounded things, such as a polymerizable oligomer or monomers, etc. which have a polymerizable vinyl group, such as acrylamide, an acrylonitrile, styrene, etc. are mentioned.

  The alignment region may have a micro uneven shape on the surface. When the modulation area 35 is formed, the rod-shaped compound in the liquid crystal layer 31 provided on the alignment layer 32 can be aligned in a predetermined direction by the fine concavo-convex shape formed on the surface of each alignment area. For example, in the liquid crystal layer 31, when it is desired to change the direction of the in-plane slow axis SA for each modulation region 35, the alignment direction of the rod-like compound changes by changing the longitudinal direction of the fine concavo-convex shape for each corresponding alignment region. Also, the direction of the in-plane slow axis SA can be changed for each of the modulation regions 35. In addition, about the fine concavo-convex shape formed in the surface of alignment field, it can be made to be the same as that of the fine concavo-convex shape of the surface of alignment field described, for example in JP, 2012-137725, A.

  The thickness of the alignment layer 32 can be, for example, 0.01 μm or more and 1.0 μm or less.

  When the liquid crystal layer 31 is thickened, the alignment control force by the alignment layer 32 is weakened. Therefore, a plurality of combinations of the liquid crystal layer 31 and the alignment layer 32 may be provided, for example, via a bonding layer such as an adhesive layer or an adhesive layer.

  The patterned retardation film 30 may have a transparent film substrate 33. The transparent film base 33 is, for example, a base that supports the liquid crystal layer 31 and the alignment layer 32. As a material of the transparent film substrate 33, a resin having high permeability is preferable. Specifically, acetyl cellulose resin such as triacetyl cellulose, polyester resin such as polyethylene terephthalate and polyethylene naphthalate, olefin resin such as polyethylene and polymethylpentene, acrylic resin, polyurethane resin, polyether sulfone And resins such as polycarbonate, polysulfone, polyether, polyether ketone, (meth) acrylonitrile, cycloolefin polymer, cycloolefin copolymer and the like. Among them, acetyl cellulose resins, resins such as cycloolefin polymers and cycloolefin copolymers, and acrylic resins are preferable because the in-plane retardation of the transparent film base material tends to be close to zero.

  The transparent film substrate 33 preferably has high transparency, and the transmittance in the visible light region is preferably 80% or more, and more preferably 90% or more. In addition, the said transmittance | permeability in the visible light area | region of the transparent film base material 33 can be measured by JISK7361-1 (The test method of the total light transmittance of a plastics-transparent material).

  The thickness of the transparent film substrate 33 is not particularly limited, but is, for example, 20 μm or more and 188 μm or less, and preferably 30 μm or more and 90 μm or less.

  When the alignment layer 32 is made of an ultraviolet curable resin, a primer layer for improving the adhesion between the transparent film substrate 33 and the ultraviolet curable resin may be formed on the transparent film substrate 33. The primer layer may be of any type as long as it has adhesiveness to both the transparent film substrate 33 and the alignment layer 32, is transparent to visible light, and allows ultraviolet rays to pass through, for example, vinyl chloride-vinyl acetate co-polymer. A layer made of a polymer-based or urethane-based resin material can be used.

  Next, the operation of the partitioning member 10 and the display image shielding laminate 20 will be described.

  First, the operation of the partitioning member 10 and the display image shielding laminate 20 exerted on the image light IL emitted from the display surface 51 of the display device 50 disposed in the chamber R will be described.

  A large amount of image light IL that is emitted from the display surface 51 of the display device 50 to form the display image 52 is light of a specific polarization state. For example, light emitted from a liquid crystal display device is generally light of a linear polarization component. An electroluminescent display (EL display) usually incorporates an anti-reflection film including a circularly polarizing plate for the purpose of preventing a decrease in contrast due to internal reflection of ambient light. And image light IL inject | emitted from the display surface 51 of the display apparatus 50 in which the anti-reflective film containing a circularly-polarizing plate was integrated is light of circularly polarized light.

  The image light IL in such a specific polarization state is emitted from the display surface 51 of the display device 50, passes through the surface layer 21 of the display image shielding laminate 20, and is incident on the pattern retardation film 30. The patterned retardation film 30 is a member capable of providing a predetermined amount of phase difference to transmitted light. However, the pattern retardation film 30 is divided into a plurality of types of modulation regions 35. The directions of the slow axes SA are different among the plurality of types of modulation regions 35. Therefore, the pattern retardation film 30 can change the polarization state of the image light IL in a specific polarization state with the same number of gradations as the plurality of types. That is, by transmitting the pattern retardation film 30, the image light IL having a certain polarization state becomes light of a plurality of polarization states depending on the transmitted modulation region 35. The image light IL transmitted through the patterned retardation film 30 is then incident on the polarizing plate 25.

  The polarizing plate 25 transmits light of a specific polarization state of the incident image light IL. The polarization state of the image light IL incident on the polarizing plate 25 is determined depending on the modulation area 35 of the patterned retardation film 30 transmitted immediately before. Therefore, when the image light IL transmitted through a certain type of modulation area 35 can pass through the polarizing plate 25 with high transmittance, it is possible to pass through the area of the display image shielding laminate 20 overlapping with the certain type of modulation area 35. The image 52 displayed on the display surface 51 of the display device 50 can be observed brightly. On the other hand, when the image light IL transmitted through another type of modulation area 35 is transmitted through the polarizing plate 25 with a low transmittance, over the area of the display image shielding laminate 20 overlapping the other type of modulation area 35 The image 52 displayed on the display surface 51 of the display device 50 can only be observed dark. As described above, according to the area distribution of the modulation area 35 of the pattern retardation film 30, the image 52 displayed on the display surface 51 is observed with uneven brightness. As a result, when observed through the display image shielding laminate 20, the image 52 can not be clearly viewed.

  On the other hand, non-polarized ambient light EL includes light of various polarization states. Therefore, the ambient light EL maintains non-polarization even after passing through each modulation area 35 of the patterned retardation film 30. Then, the ambient light EL transmitted through each of the modulation regions 35 includes light of a specific polarization state that can be transmitted through the polarizing plate 25 at a constant ratio. Therefore, the non-polarizing ambient light EL passes through the polarizing plate 25 with a uniform transmittance, for example, a transmittance of 50%, without depending on the region distribution of the modulation region 35 of the patterned retardation film 30. For this reason, it is possible to observe the situation in the room R by observing the situation in the room R excluding the display surface 51 of the display device 50 through the display image shielding laminate 20.

  Here, the display image 52 observed through the display image shielding laminate 20 including the pattern retardation film 30 of FIG. 3 will be described in more detail with reference mainly to FIGS. 3 to 6.

  As described above, the patterned retardation film 30 shown in FIGS. 3 and 4 functions as a λ / 2 retardation film. The patterned retardation film 30 has a plurality of first modulation regions 35 a and a plurality of second modulation regions 35 b. The first modulation regions 35a and the second modulation regions 35b are alternately arranged in one direction, and the first modulation regions 35a and the second modulation regions 35b extend in the other direction that is not parallel to one direction. The slow axis SA of the first modulation area 35a makes an angle of 0 ° with respect to the reference direction sd, and the slow axis SA of the second modulation area 35b makes an angle of 45 ° with the reference direction sd. There is. Further, as shown in FIG. 4, the polarizing plate 25 includes a polarizer having an absorption axis AA parallel to a direction orthogonal to the reference direction sd. That is, the polarizing plate 25 transmits the linearly polarized light component vibrating in the reference direction sd, and absorbs the linearly polarized light component vibrating in the direction orthogonal to the reference direction sd.

  The pattern retardation film 30 functioning as a λ / 2 retardation film has an angle of θ [°] between the vibration direction of the linearly polarized component and the slow axis SA with respect to the transmitted light of the linearly polarized component, and the angle The direction of oscillation of the linear polarization component is rotated by an angle [°] twice that of θ, ie, “2 × θ [°]”.

  Here, as shown in FIG. 4, it is assumed that the image light IL emitted from the display surface 51 of the display device 50 is a linearly polarized light component vibrating in a direction parallel to the reference direction sd. In this assumption, with respect to the image light IL incident on the first modulation region 35a of the patterned retardation film 30, the angle θ between the vibration direction of the linear polarization component and the slow axis SA is 0 °. Therefore, the image light IL transmitted through the first modulation region 35a is maintained without changing the polarization state before and after transmission. That is, the image light IL transmitted through the first modulation area 35a is a linearly polarized light component vibrating in a direction parallel to the reference direction sd. Such a linearly polarized light component is a linearly polarized light component which can be transmitted through the polarizing plate 25. Therefore, the image light IL transmitted through the first modulation region 35 a passes through the polarizing plate 25 as it is.

  On the other hand, for the image light IL incident on the second modulation area 35b of the patterned retardation film 30, the angle θ between the vibration direction of the linearly polarized light and the slow axis SA is 45 °. Therefore, the image light IL transmitted through the second modulation region 35 b rotates the vibration direction of the linearly polarized light component by 90 ° by transmitting through the patterned retardation film 30. That is, by transmitting through the second modulation region 35b, the polarization state of the image light IL is changed from a linearly polarized component oscillating in a direction parallel to the reference direction sd to a linearly polarized component oscillating in a direction orthogonal to the reference direction sd. It is converted. Such a linearly polarized light component is a linearly polarized light component absorbed by the polarizing plate 25. Therefore, the image light IL transmitted through the second modulation region 35 b is absorbed by the polarizing plate 25 and can not be transmitted through the polarizing plate 25.

  According to the function of the display image shielding laminate 20 including the pattern retardation film 30 shown in FIG. 3 as described above, the inside of the display image shielding laminate 20 overlapping the first modulation region 35 a of the pattern retardation film 30 is obtained. The image 52 formed by the image light IL can be observed on the display surface 51 of the display device 50 through the area. On the other hand, the image 52 can not be observed on the display surface 51 via the region in the display image shielding laminate 20 overlapping the second modulation region 35 b of the pattern retardation film 30, and the display surface 51 is observed black. Become so. Specifically, assuming that the image 52 shown in FIG. 5 is displayed on the display surface 51 of the display device 50, it is observed that the image 52 shown in FIG. 5 is observed on the display surface 51 via the pattern retardation film 30. As shown in 6, an image 52 on a stripe is obtained. About the stripe-like image 52 shown by FIG. 6, it is difficult to grasp the contents.

  In the example shown in FIG. 3 and FIG. 4, even when the polarizing plate 25 has the absorption axis AA parallel to the reference direction sd, the same function and effect can be obtained. However, in this example, the image 52 is not observed in the area in the display image shielding laminate 20 overlapping the first modulation area 35a, and the image 52 is in the area in the display image shielding laminate 20 overlapping the second modulation area 35b. It will be observed.

  Further, even if the image light IL emitted from the display surface 51 of the display device 50 is a linearly polarized light component vibrating in a direction orthogonal to the reference direction sd, the same operation and effect can be obtained.

  Furthermore, even if the image light IL emitted from the display surface 51 of the display device 50 is a linearly polarized light component that vibrates in a direction inclined 45 ° with respect to the reference direction sd, similar effects can be obtained. However, in this example, the image 52 is not observed in the area in the display image shielding laminate 20 overlapping the first modulation area 35a, and the image 52 is in the area in the display image shielding laminate 20 overlapping the second modulation area 35b. It will be observed.

  By the way, a two-tone pattern retardation film 30 in which modulation regions 35 are arranged in a stripe arrangement is actually produced, and further, the produced pattern retardation film 30 is laminated with a polarizing plate 25 to form a display image shielding laminate 20. Made. FIG. 14 is a photograph of the display surface 51 of the display device 50 of a personal computer, which is observed through the manufactured display image shielding laminate 20. It can also be understood from the photograph of FIG. 14 that it is difficult to grasp the image 52 when the display surface 51 of the display device 50 is observed through the display image shielding laminate 20.

  Another example of the patterned retardation film 30 is disclosed in FIGS. 7 to 13. Also by observing the display surface 51 of the display device 50 through another pattern retardation film 30 disclosed in these figures, it is possible to make the grasping of the display image 52 extremely difficult.

  First, the example shown in FIG. 7 will be described. In the example shown in FIG. 3 described above, the pattern retardation film 30 can include two types of modulation regions 35 and can cause phase modulation in two gradations with respect to transmitted light. However, the number of types of modulation regions 35 included in the patterned retardation film 30 may be three or more.

  In the example shown in FIG. 7, the patterned retardation film 30 functions as a λ / 2 retardation film. The patterned retardation film 30 further includes a plurality of third modulation regions 35c in addition to the plurality of first modulation regions 35a and the plurality of second modulation regions 35b described above. The first modulation area 35a, the third modulation area 35c, and the second modulation area 35b are alternately arranged in one direction, and each of the first modulation area 35a, each third modulation area 35c, and each second modulation area 35b is It is elongated in the other direction not parallel to the direction. The slow axis SA of the first modulation area 35a forms an angle of 0 ° with respect to the reference direction sd, and the slow axis SA of the third modulation area 35c forms an angle of 22.5 ° with the reference direction sd. None, the slow axis SA of the second modulation area 35b is at an angle of 45 ° with respect to the reference direction sd. It is assumed that the polarizing plate 25 included in the display image shielding laminate 20 is configured in the same manner as the example described above. That is, the polarizing plate 25 transmits the linearly polarized light component vibrating in the reference direction sd, and absorbs the linearly polarized light component vibrating in the direction orthogonal to the reference direction sd.

  When the display image shielding laminate 20 including the patterned retardation film 30 shown in FIG. 7 is used, as described with reference to FIG. 4, the image light IL transmitted through the first modulation area 35 a is as it is. The light passes through the polarizing plate 25. Further, the image light IL transmitted through the second modulation region 35 b is absorbed by the polarizing plate 25 and can not be transmitted through the polarizing plate 25.

  On the other hand, with the image light IL incident on the third modulation region 35c of the patterned retardation film 30, the angle θ between the vibration direction of the linear polarization component and the slow axis SA is 22.5 °. Therefore, the image light IL transmitted through the second modulation area 35 b rotates the vibration direction of the linearly polarized light by 45 ° by transmitting the pattern retardation film 30. That is, by transmitting through the third modulation region 35c, the polarization state of the image light IL vibrates in the direction forming 45 ° with respect to the reference direction sd from the linearly polarized light component vibrating in the direction parallel to the reference direction sd. It is converted to a linear polarization component. The vibration direction of such a linearly polarized light component is inclined 45 ° with respect to the vibration direction of the linearly polarized light component that can be transmitted through the polarizing plate 25. Therefore, the image light IL transmitted through the second modulation region 35 b is absorbed by the polarizing plate 25 by approximately half, and is transmitted by the polarizing plate 25 by approximately half.

  According to the function of the display image shielding laminate 20 including the pattern retardation film 30 shown in FIG. 7 as described above, the inside of the display image shielding laminate 20 overlapping the third modulation region 35 c of the pattern retardation film 30 is obtained. The image 52 formed by the image light IL can be observed dark on the display surface 51 of the display device 50 through the area. Specifically, assuming that the image 52 shown in FIG. 5 is displayed on the display surface 51 of the display device 50, what is observed on the display surface 51 via the pattern retardation film 30 is FIG. The image 52 shown in FIG. The image 52 shown in FIG. 8 includes a stripe-shaped non-observable region overlapping the second modulation region 35 b and a stripe-shaped dark region only overlapping the third modulation region 35 c. As a result, it is difficult to grasp the contents of the image 52 shown in FIG.

  Next, in the example shown in FIG. 9, the patterned retardation film 30 functions as a λ / 2 retardation film. The patterned retardation film 30 includes many types of modulation regions 35. In the illustrated example, the angle formed by the slow axis SA with respect to the reference direction sd gradually changes from 0 °. For example, it includes 180 types of modulation regions 35 in which the angle formed by the slow axis SA with respect to the reference direction sd changes by 1 ° from 0 ° to 179 °. Also in the example shown in FIG. 9, the plurality of modulation regions 35 are alternately arranged in one direction, and each modulation region 35 is elongated in the other direction that is not parallel to one direction. In FIG. 9, the direction of the slow axis SA is indicated by line segments in each of the modulation regions 35.

  It is assumed that the polarizing plate 25 included in the display image shielding laminate 20 is configured in the same manner as the example described above. That is, the polarizing plate 25 transmits the linearly polarized light component vibrating in the reference direction sd, and absorbs the linearly polarized light component vibrating in the direction orthogonal to the reference direction sd. When the display image shielding laminate 20 including the pattern retardation film 30 shown in FIG. 9 is used, as described above, the light passes through the modulation area 35 in which the slow axis SA is parallel to the reference direction sd. The image light IL passes through the polarizing plate 25 as it is. The image light IL transmitted through the modulation area 35 in which the slow axis SA forms an angle of 45 ° with the reference direction sd is absorbed by the polarizing plate 25. In a large number of modulation regions 35 located between these two types of modulation regions 35, the angle formed by the slow axis SA with respect to the reference direction sd gradually increases or decreases.

  As a result, assuming that the image 52 shown in FIG. 5 is displayed on the display surface 51 of the display device 50, what is observed on the display surface 51 via the pattern retardation film 30 is shown in FIG. It becomes an image 52. The image 52 shown in FIG. 10 includes an area where the image can not be observed and an area where the image can be observed. In addition, even in the area where the image can be observed, the brightness of the image continuously changes along the horizontal direction which is the arrangement direction of the modulation regions 35. As a result, it is difficult to grasp the contents of the image 52 shown in FIG.

  In addition, it is the pattern retardation film 30 of 45 gradations which arranged the modulation area | region 35 by stripe arrangement | sequence, and actually produces the pattern retardation film 30 containing 180 types of modulation area | regions, Furthermore, the produced pattern retardation film 30 was laminated | stacked with the polarizing plate 25, and the display image shielding laminated body 20 was produced. FIG. 15 is a photograph of the display surface 51 of the display device 50 of a personal computer observed through the manufactured display image shielding laminate 20. As shown in FIG. It can also be understood from the photograph of FIG. 15 that it is difficult to grasp the image 52 when the display surface 51 of the display device 50 is observed through the display image shielding laminate 20.

  Next, an example shown in FIG. 11 will be described. In the specific example shown in FIG. 3, FIG. 7 and FIG. 9 described above, the plural types of modulation regions 35 are arranged in one direction, and each modulation region 35 is elongated in another direction not parallel to one direction. The However, the arrangement of the plurality of types of modulation regions 35 is not particularly limited. For example, the pattern retardation film 30 is divided into areas by a stripe arrangement, a square arrangement, a delta arrangement, a staggered arrangement, an arrangement of triangles, an arrangement of a plurality of shapes, etc. It may be allocated to the modulation area 35 of

  In the example shown in FIG. 11, the pattern retardation film 30 is divided in a square arrangement. The patterned retardation film 30 includes a first modulation area 35a and a second modulation area 35b. The plurality of first modulation regions 35a are arranged in a staggered arrangement, and the plurality of second modulation regions 35b are arranged in a staggered arrangement.

  Similar to the example shown in FIG. 3 described above, the slow axis SA of the first modulation area 35a forms an angle of 0 ° with respect to the reference direction sd, and the slow axis SA of the second modulation area 35b is It is assumed that an angle of 45 ° is formed with respect to the reference direction sd. Further, it is assumed that the polarizing plate 25 included in the display image shielding laminate 20 is also configured in the same manner as the above-described example. When the image 52 shown in FIG. 5 is displayed on the display surface 51 of the display device 50, what is observed on the display surface 51 via the pattern retardation film 30 is the image 52 shown in FIG. . An image 52 shown in FIG. 12 includes an area where the image can be observed and an area where the image can not be observed. The area where the image can be observed is an area overlapping with the first modulation area 35a, and has a staggered arrangement as in the arrangement of the first modulation area 35a. Further, the area where the image can not be observed is an area overlapping with the second modulation area 35b, and has a staggered arrangement as in the arrangement of the second modulation area 35b. As a result, it is difficult to grasp the contents of the image 52 shown in FIG.

  In addition, a two-tone pattern retardation film 30 in which modulation regions 35 are arranged in a staggered arrangement is actually produced, and further, the produced pattern retardation film 30 is laminated with a polarizing plate 25 to form a display image shielding laminate 20. Made. FIG. 16 is a photograph of the display surface 51 of the display device 50 of the personal computer, which is observed through the produced display image shielding laminate 20. It can be understood from the photograph of FIG. 16 that it is difficult to grasp the image 52 when the display surface 51 of the display device 50 is observed through the display image shielding laminate 20.

  When the pattern retardation film 30 is divided into areas and each divided small area is allocated to each type of modulation area 35, the arrangement of each type of modulation area 35 may be regular or irregular. It may be Further, the area division itself of the patterned retardation film 30 may be regular or irregular as shown in FIG. In the patterned retardation film 30 shown in FIG. 14, each modulation area 35 has an irregular planar shape.

  By the way, as described above, the brightness of the display image 52 is changed according to the area division of the modulation area 35 of each type. Then, from the viewpoint of making it difficult to visually recognize the display image 52, in the two-gradation pattern retardation film 30 shown in FIG. 3, the width W2 (see FIG. 3) along the arrangement direction of each modulation region 35 is 0. It is preferable to set it as .1 mm or more and 30 mm or less. Further, from the viewpoint of making it difficult to visually recognize the display image 52, the width W3 (see FIG. 7) along the arrangement direction of each modulation region 35 in the three-gradation pattern retardation film 30 shown in FIG. It is preferable to set it as 0.1 mm or more and 30 mm or less. Furthermore, from the viewpoint of making it difficult to visually recognize the display image 52, in the multi-tone pattern retardation film 30 shown in FIG. 9 in which the direction of the slow axis SA gradually changes, the direction of the slow axis SA is 45. It is preferable to set the width along the arrangement direction to a change of less than 9 mm. Furthermore, in the pattern retardation film 30 shown in FIG. 9, from the viewpoint of making it possible to observe as if the brightness of the image 52 to be observed is continuously changing, the direction along the arrangement direction of one modulation region 35 The width is preferably 0.01 mm or more and 1 mm or less. Furthermore, from the viewpoint of making it difficult to visually recognize the display image 52, in the pattern retardation film 30 shown in FIGS. 11 and 13 in which the modulation regions 35 are two-dimensionally arranged, the modulation regions 35 in two directions orthogonal to each other. It is preferable to set the widths Wx and Wy to 0.1 mm or more and 30 mm or less.

  Here, in the multi-gradation pattern retardation film 30 in which the direction of the slow axis SA as shown in FIG. 9 gradually changes, the width along the arrangement direction until the direction of the slow axis SA changes by 45 ° is When S is designated, samples of a plurality of patterned retardation films 30 having different values of S are prepared, laminated with a polarizing plate 25 to form a display image shielding laminate 20, and a bonding layer 17 is formed on the light transmitting member 15. The viewer E visually observes the image 52 displayed on the display surface 51 of the display device 50 through the partitioning member 10, and the appearance thereof is evaluated.

FIG. 21 is a diagram showing the positions of the display device 50, the partitioning member 10, and the observer E at the time of visual evaluation.
Along the normal direction of the display surface 51, the distance from the geometric center of the display surface 51 to the display device 50 side surface 10a of the dividing member 10 is taken as a first distance L1, and along the normal direction of the display surface 51. The distance from the surface 10a of the dividing member 10 to the eye of the observer E is a second distance L2. At this time, the display surface 51 and the both surfaces of the dividing member 10 are disposed parallel to each other, pass through the geometrical center of the display surface 51, and are on the straight line orthogonal to the display surface 51. E shall be located.
The observer E is provided with the pattern retardation films 30 of the samples 1 to 7 having different widths S along the arrangement direction of the modulation area 35 until the direction of the slow axis SA of the modulation area 35 changes by 45 °. The images 52 displayed on the display surface 51 of the display device 50 were observed through 10 and visually evaluated for the image shielding effect of the pattern retardation film of each sample, that is, the visual difficulty of the image.

Each condition at the time of a visual evaluation test is as follows.
In the patterned retardation films of Samples 1 to 7, the values of S are 0.1 mm, 1 mm, 3 mm, 5 mm, 8.5 mm, 9 mm, 13 mm in order.
Further, in the image 52 displayed on the display surface 51, characters are displayed in black characters on the white screen, and the font size of the characters is 10.5 points.
In the case where L1 = 1.7 m and L2 = 0.3 m (L1 + L2 = 2 m) for the first distance L1 and the second distance L2 (condition 1), L1 = 0.9 m, L2 = 0.1 m. In the case of (L1 + L2 = 1 m) (condition 2).
As for condition 1, when a person visually recognizes a character having a size of about 10.5 points, it is difficult to read the character if the character is more than 2 m. Therefore, L1 + L2 = as the maximum value of the generally readable distance. It was 2m. Condition 1 assumes that, for example, the observer E looks into the chamber R through the dividing member 10 when the observer E passes in front of the dividing member 10 of the chamber R.
Regarding Condition 2, it is assumed that the observer E and the display surface 51 are closer than in Condition 1, and it is assumed that the observer E consciously approaches the dividing member 10 and looks into the room R. .
Further, the visual evaluation was performed in the room R and the observer E in a bright room environment.

In this visual evaluation test, the observer E is observed by the pattern retardation film 30 so that the brightness of the image 52 on the display surface 51 is continuously changed and a part of the image 52 is shielded, and the image is viewed The case where it is impossible to read the displayed character or the displayed character is regarded as good (◎ shown in Table 1 below), and it is slightly inferior to this, but the visual recognition of the image 52 and the reading of the displayed character are difficult. It was evaluated as acceptable (o shown in Table 1 below), and a case where visual recognition of an image and character reading were possible was evaluated as impossible (x shown in Table 1 below).
Although it is more preferable to set it as the pattern retardation film 30 which is good or good in condition 1 and condition 2, as the pattern retardation film 30, even if it is impossible in condition 2 if it is good or good in condition 1, The present invention is sufficiently applicable to a general display image shielding laminate 20.

As in Samples 1 to 5 shown in Table 1, with the display image shielding laminate 20 provided with the patterned retardation film 30 satisfying S <9 mm, a sufficient shielding effect of the image 52 can be obtained, and visual recognition of the image is difficult It was also difficult to read the letters. In addition, as in Samples 1 to 4 shown in Table 1, in the case of a display image shielding laminate 20 provided with a patterned retardation film 30 satisfying S ≦ 5 mm, an image sufficient under more severe conditions such as Condition 2 52 shielding effects were obtained, and visual recognition of the image 52 and reading of characters were difficult.
Further, as the width S along the arrangement direction of the modulation regions 35 until the direction of the slow axis SA of the modulation region 35 changes by 45 °, there is a tendency that a higher image shielding effect can be obtained. However, depending on the number of gradations of the patterned retardation film 30, etc., it is difficult to manufacture a patterned retardation film of S = 0.01 or less.
From the above, the width S along the arrangement direction of the modulation area 35 until the direction of the slow axis SA of the pattern retardation film 30 changes by 45 ° is less than 9 mm (S <9 mm is satisfied) preferable. The value of S is more preferably 5 mm or less (S ≦ 5 mm is satisfied).

  According to the embodiment described above, the following effects can be obtained.

  A large amount of image light IL that is emitted from the display surface 51 of the display device 50 to form the display image 52 is light of a specific polarization state. For example, light emitted from a liquid crystal display device is generally light of a linear polarization component, and image light emitted from a display surface of a display device using an anti-reflection film including a circularly polarizing plate is circularly polarized light It is the light of

  On the other hand, in the above-described embodiment, the patterned retardation film 30 which is laminated with the polarizing plate 25 and constitutes the display image shielding laminate 20 together with the polarizing plate 25 has plural types of modulations in which the slow axes SA are different from each other. Region 35 is included. Therefore, light of a specific polarization state transmitted through different modulation areas 35 of the patterned retardation film 30 is given a phase difference by a different amount. That is, the polarization states of the image light IL transmitted through different modulation regions 35 become different from each other. Then, the image light IL having different polarization states is transmitted through the polarizing plate 25 with a transmittance depending on the polarization state. That is, the image light IL transmitted through different regions of the patterned retardation film 30 is then transmitted through the polarizing plate 25 with different transmittances according to the modulation region 35. Therefore, when the display surface 51 is observed through the display image shielding laminate 20, the brightness of the display surface 51 of the display device 50 is different corresponding to the division of the modulation region 35 of the pattern retardation film 30. It is visible. Thereby, when the display surface 51 is observed through the display image shielding laminate 20, it is possible to make it difficult to effectively grasp the content of the image 52 displayed on the display surface 51. That is, by observing the display surface 51 through the display image shielding laminate 20, it is possible to make the display image 52 less visible.

  However, on the other hand, the transmittance of the display image shielding laminate 20 for the non-polarized environmental light EL does not depend on the division of the modulation region 35 in the pattern retardation film 30 and is substantially constant transmittance, for example It becomes uniform at 50% transmittance.

  That is, the specific modulation area 35 of the display image shielding laminate 20 determined depending on the polarization state of the image light IL selectively absorbs and shields the image light IL and selectively transmits the non-polarized ambient light EL. . In other words, the specific modulation area 35 transmits the image light IL in a specific polarization state at a lower transmittance than the non-polarized environmental light EL, and transmits the ambient light EL at a higher transmittance than the image light IL. . Thereby, the partitioning member 10 including the display image shielding laminate 20 may make it difficult to visually recognize only the image 52 displayed on the display surface 51 of the display device 50 while securing the translucency of the environmental light EL. it can. That is, according to the present embodiment, the image 52 displayed on the display surface 51 of the display device 50 can be selectively selected while sufficiently securing the visibility through the partitioning member 10 including the display image shielding laminate 20. It can be difficult to visually recognize.

  Further, in the specific example of the embodiment described above, each modulation region 35 functions as a λ / 2 retardation film. When a phase difference of λ / 2 [nm] is given, it is possible to convert the light of one linearly polarized component to the light of the other linearly polarized component. That is, by dispersing the direction of the slow axis SA, in other words, by providing a sufficient type of modulation region 35, the light is absorbed by the polarizing plate 25 without depending on the polarization state of the image light IL. It is possible to convert the polarization state of the image light IL into a linear polarization component to be obtained. In this case, the display surface 51 is observed to be black in the area of the display image shielding laminate 20 overlapping with any of the modulation areas 35. Thereby, by observing through the display image shielding laminate 20, it is possible to make it difficult to visually recognize the image 52 displayed on the display surface 51 of the display device 50 more effectively.

  However, the retardation of the patterned retardation film 30 is not limited to λ / 2, and can be set to various values [nm]. For example, each modulation area may function as a λ / 4 retardation film. When a phase difference of λ / 4 [nm] is given, circularly polarized light can be converted into linearly polarized light. That is, it becomes possible to convert circularly polarized image light into a linearly polarized component that can be absorbed by the polarizing plate 25. In this case, in the area of the display image shielding laminate 20 overlapping with any of the modulation areas 35, the transmittance of the image light IL is largely reduced, and the area of the display surface 51 can be easily observed black. Thereby, by observing through the display image shielding laminate 20, it is possible to make it difficult to visually recognize the image 52 displayed on the display surface 51 of the display device 50 more effectively.

  Furthermore, in the specific example of the embodiment described above, the patterned retardation film 30 includes two kinds of modulation regions different in the direction of the slow axis SA by 45 °. The image light IL emitted from the display device 50 is often a linear polarization component, and the vibration direction is horizontal, a direction forming an angle of 90 ° with respect to the horizontal, or with respect to the horizontal The direction is 45 degrees. On the other hand, according to the patterned retardation film 30 including two types of modulation regions 35 different in the direction of the slow axis SA by 45 °, the phase difference provided by each type of modulation region 35 is largely different. In this case, in the area of the display image shielding laminate 20 overlapping with any of the modulation areas 35, the transmittance of the image light IL is largely reduced, and the area of the display surface 51 can be easily observed black. Thereby, by observing through the display image shielding laminate 20, it is possible to make it difficult to visually recognize the image 52 displayed on the display surface 51 of the display device 50 more effectively.

  Furthermore, in the specific example of the embodiment described above, the patterned retardation film 30 includes three or more types of modulation regions 35 in which the directions of the slow axes SA are different from each other. By providing three or more modulation regions 35 in which the directions of the slow axis SA are different from each other, the phase difference given to the image light IL can be changed to three or more types. In this case, in the area of the display image shielding laminate 20 overlapping with any of the modulation areas 35, the transmittance of the image light IL is largely reduced, and the area of the display surface 51 can be easily observed black. Thereby, by observing through the display image shielding laminate 20, it is possible to make it difficult to visually recognize the image displayed on the display surface 51 of the display device 50 more effectively.

  Furthermore, in the specific example of the embodiment described above, the pattern retardation film 30 is configured to include three or more types of modulation regions 35 in which the direction of the slow axis SA gradually changes. The phase difference provided by the three or more types of modulation regions 35 in which the orientation of the slow axis SA gradually changes is gradually changed. In this case, the transmittance of the image light IL gradually changes in each region of the display image shielding laminate 20 corresponding to each type of modulation region 35. Thereby, by observing through the display image shielding laminate 20, it is possible to make it difficult to visually recognize the image 52 displayed on the display surface 51 of the display device 50 more effectively. Furthermore, designability and unexpectedness can also be brought about, and according to the application of the partition member 10 including such a display image shielding laminate 20, it also helps to effectively produce the atmosphere of the space.

  Furthermore, in the specific example of the embodiment described above, the pattern retardation film 30 is provided with a plurality of modulation regions 35 of each type. In this case, when the transmittance of the image light IL is largely reduced, a plurality of regions in which the display surface 51 is observed black are dispersed and present in the display image shielding laminate 20. Thereby, by observing through the display image shielding laminate 20, it is possible to make it difficult to visually recognize the image 52 displayed on the display surface 51 of the display device 50 more effectively.

  Furthermore, in the specific example of the embodiment described above, in the patterned retardation film 30, the plurality of types of modulation regions 35 are arranged irregularly. In this case, when the transmittance of the image light IL is largely reduced, a plurality of regions in which the display surface 51 is observed black are dispersed and present in the display image shielding laminate 20. Thereby, by observing through the display image shielding laminate 20, it is possible to make it difficult to visually recognize the image 52 displayed on the display surface 51 of the display device 50 more effectively.

  Although one embodiment has been described above with reference to a plurality of specific examples, these specific examples are not intended to limit the one embodiment. The embodiment described above can be implemented in various other specific examples, and various omissions, replacements, and changes can be made without departing from the scope of the invention.

  Hereinafter, an example of a modification will be described with reference to the drawings. In the following description and the drawings used in the following description, with respect to parts that can be configured in the same manner as the specific example described above, the same reference numerals as those used for the corresponding parts in the specific example described above are used Omit.

  For example, in the specific example described above, an example is shown in which only the pattern retardation film 30 imparts a phase difference to light transmitted through the display image shielding laminate 20, but the present invention is not limited thereto. The display image shielding laminate 20 shown in FIG. 17 has the λ / 4 retardation film 40, the patterned retardation film 30, and the polarizing plate 25 in this order from the side of the display device 50. In the display image shielding laminate 20 shown in FIG. 17, the λ / 4 retardation film 40 gives a retardation of λ / 4 [nm] to the transmitted light. In the illustrated example, the slow axis SA of the λ / 4 retardation film 40 forms an angle of 45 ° with the reference direction sd.

  Further, in the example shown in FIG. 17, the patterned retardation film 30 functions as a λ / 4 retardation film. That is, the retardation of the patterned retardation film 30 shown in FIG. 17 is λ / 4 [nm]. The patterned retardation film 30 has a plurality of first modulation regions 35 a and a plurality of second modulation regions 35 b. The first modulation regions 35a and the second modulation regions 35b are alternately arranged in one direction, and the first modulation regions 35a and the second modulation regions 35b extend in the other direction that is not parallel to one direction. The slow axis SA of the first modulation region 35a forms an angle of -45 ° with respect to the reference direction sd, and the slow axis SA of the second modulation region 35b forms an angle of 45 ° with respect to the reference direction sd ing.

  In this example, the slow axis SA of the λ / 4 retardation film 40 and the slow axis SA of the second modulation region 35 b of the patterned retardation film 30 are in the same direction. Therefore, light transmitted through the λ / 4 retardation film 40 and transmitted through the second modulation region 35 b of the patterned retardation film 30 is given a retardation of λ / 2 (= λ / 4 + λ / 4) [nm]. Ru. On the other hand, the slow axis SA of the λ / 4 retardation film 40 and the slow axis SA of the first modulation region 35 a of the patterned retardation film 30 are orthogonal to each other. Therefore, light transmitted through the λ / 4 retardation film 40 and transmitted through the first modulation region 35 a of the patterned retardation film 30 is not provided with a retardation. That is, the display image shielding laminate 20 shown in FIG. 17 exerts the same action on transmitted light as the display image shielding laminate 20 shown in FIG.

  When the image light IL is light of one linearly polarized component vibrating in the reference direction sd, the polarization state of the image light IL is converted into one circularly polarized light by transmitting through the λ / 4 retardation film 40 . Next, when the image light IL converted into circularly polarized light passes through the first modulation region 35a of the patterned retardation film 30, it is returned to the polarization state into one linearly polarized light component. On the other hand, when the image light IL converted into circularly polarized light passes through the second modulation region 35b of the patterned retardation film 30, it is converted into the other linearly polarized light component into the polarization state. As a result, when the display surface 51 of the display device 50 is observed through the display image shielding laminate 20, the image 52 is visually recognized in the area overlapping with the first modulation area 35a, and the image 52 is in the area overlapping with the second modulation area 35b. The black display surface 51 is observed without being observed.

  Moreover, in the specific example mentioned above, although the example which the display image shielding laminated body 20 was laminated | stacked inside chamber R of the translucent member 15 was shown, it is not this limitation, but the display image shielding laminated body 20 is transparent. It may be laminated on the outside of the chamber R of the light emitting member 15.

  Moreover, in the specific example mentioned above, although the display image shielding laminated body 20 showed the example containing the polarizing plate 25 laminated | stacked on one side of the translucent member 15, and the pattern retardation film 30, it restricts to this example. I can not. As shown in FIG. 18, a pattern retardation film 30 in which the display image shielding laminate 20 is laminated on one side of the light transmitting member 15 and a polarizing plate in which the display image shielding laminate 20 is laminated on the other side of the light transmitting member 15 And 25 may be included. In the example shown in FIG. 18, the polarizing plate 25 and the patterned retardation film 30 are each bonded to the light transmitting member 15 via another bonding layer 17.

  Furthermore, although the example shown in FIG. 1 and FIG. 2 shows the example in which the display image shielding laminate 20 is laminated on the entire surface of the dividing member 10, the present invention is not limited to this example. As in the example shown in FIG. 19, the display image shielding laminate 20 may be laminated only in the area of a part of the dividing member 10.

  Furthermore, in the specific example mentioned above, although the example in which the dividing member 10 comprises a part of wall W which divides chamber R as building materials 5 was shown, it is not restricted to this. For example, as shown in FIG. 20, the partition member 10 may be used as a part of the partition 6. In the example shown in FIG. 20, the partition 6 includes the opening 6 a, and the dividing member 10 is fitted into the opening 6 a and functions as the window member 11.

Reference Signs List 5 building material 5a opening 6 partition 6a opening 10 partitioning member 11 window member 15 light transmitting member 17 bonding layer 20 display image shielding laminate 21 surface layer 25 polarizing plate 30 pattern retardation film 31 liquid crystal layer 32 alignment layer 33 base material 35 modulation area 35a first modulation area 35b second modulation area 35c third modulation area 40 λ / 4 retardation film 50 display 51 display surface 52 image IL image light EL ambient light sd reference direction SA slow axis AA absorption axis R Room D Door W Wall

Claims (11)

A patterned retardation film which is laminated with a polarizing plate to constitute a display image shielding laminate together with the polarizing plate,
A patterned retardation film comprising a plurality of types of modulation regions in which the directions of slow axes are different from each other.   The patterned retardation film according to claim 1, wherein each modulation region functions as a λ / 2 retardation film.   The patterned retardation film according to claim 1, wherein each modulation region functions as a λ / 4 retardation film.   The pattern retardation film as described in any one of Claims 1-3 provided with three or more types of modulation | alteration area | regions where directions of a slow axis mutually differ.   The pattern retardation film as described in any one of Claims 1-4 provided with two types of modulation | alteration area | regions which direction of the slow axis differs by 45 degrees.   The pattern retardation film as described in any one of Claims 1-5 provided with three or more types of modulation area | regions where direction of the slow axis changes gradually.   The pattern retardation film according to claim 6, wherein the width along the arrangement direction of the modulation area until the direction of the slow axis changes by 45 ° is less than 9 mm.   The pattern retardation film according to any one of claims 1 to 7, wherein a plurality of modulation regions of each type are provided. The pattern retardation film as described in any one of Claims 1-8,
A display image shielding laminate, comprising: a polarizing plate laminated on the patterned retardation film. The pattern retardation film according to claim 3;
A λ / 4 retardation film laminated on the patterned retardation film;
A display image shielding laminate, comprising: a polarizing plate laminated on the patterned retardation film. A translucent member that divides a space;
The display image shielding laminated body of Claim 9 laminated | stacked on the said translucent member, and division member.